It is not especially tall, and it would be easy to walk past without giving it much thought. Look more closely at the southern face, however, and three small cup-marks become visible, shallow circular depressions each no more than five centimetres across, pecked deliberately into the stone's surface by someone working in prehistory whose name and purpose are entirely lost to us.

Cup-marks are among the most enigmatic features found on standing stones and rock surfaces across Ireland and Britain. They appear consistently enough to be clearly intentional, yet no consensus exists on what they meant to the people who made them. The Urhin stone shows additional evidence of deliberate working: picked dressing, a technique of shaping stone by repeated pecking with a harder tool, is visible on the southern face, the upper surface, and the top of the eastern face. This is not a rough, unworked boulder simply pushed upright; it was shaped, at least partially, before or after it was raised. The stone measures 0.56 metres by 0.35 metres in cross-section, giving it a solid, block-like presence that would have been visible across the surrounding pasture from a considerable distance, particularly with Coulagh Bay providing a clear horizon to the south.